About MSO Calc

A simple, no-nonsense hub of accurate online calculators for finance, health, math, unit conversion and everyday questions.

What This Site Is

MSO Calc is a collection of calculators that just work. You came here with a question — what's my BMI, what will my mortgage payment be, how much should I save each month — and our job is to give you a clear, accurate answer as quickly as possible, with enough context to actually use the number. No paywall, no sign-up, no upsell to a financial product, no email harvesting.

What We Believe

• Calculators should be free. The math behind them is hundreds of years old. There's no good reason to gate access.
• Privacy is a default, not a feature. Every calculation runs in your browser. We don't see your numbers because we don't collect them.
• Transparency matters. We document the formulas. If you spot a math error, tell us — see the contact page.
• Show, don't just tell. Every result page explains what the numbers mean, not just what they are. A BMI of 24 is more useful with the context that you're at the upper end of the "healthy" range.

How We Make Money

Display advertising. You'll see ad slots throughout the site, served by Google AdSense. Ads cover the cost of building, hosting and maintaining the site. We do not sell user data, run sponsored "calculator recommendations," or take affiliate kickbacks for steering you toward a specific lender, broker or product. If a calculator tells you renting beats buying, that's the math — not because we get paid more by realtors.

About the Math

Calculators use the standard, textbook-correct formulas: amortization formula for loans/mortgages, future-value-of-annuity for investing, Mifflin-St Jeor for BMR, Heron for triangle area, and so on. Where there's professional disagreement (which is most common in health calculations), we mention the alternatives.

Important Disclaimer

MSO Calc provides educational tools and information only. Nothing on this site is financial, tax, legal or medical advice. While we test calculations and use established formulas, software has bugs and inputs can be wrong — results may contain errors. Always verify important numbers with a qualified professional before making meaningful decisions. See our full disclaimer.

Tech

The entire site is static HTML/CSS/JS. There's no backend, no database, no user accounts. Calculations happen in your browser. The site loads fast, works offline once cached, and doesn't track you. You can save any calculator page as a bookmark and it'll work the same way it does today years from now.

Contact

Bug, math error, suggestion or general feedback? Reach us via the contact page. We read everything.